Couplings
Pneumatic connection technology
Festo couplings allow tool-free disconnection and reconnection of compressed air lines without depressurising the installation. The range includes coupling sockets in series KD1 (M3), KD2 (M5/CK) and KD3/KD4 (1/8" to 1/2" BSP and CK push-in), plus push-in socket KDV-PK for coupling directly to standard tubing. Internal thread (-I) and external thread (-A) variants give flexible mounting options.
Compressed air quick-coupling - tool-free push and pull without system depressurisation
Thread sizes M3 to 1/2" BSP - series KD1 (M3), KD2 (M5, CK3, CK4), KD3/KD4 (1/8"-1/2")
External (-A) and internal (-I) thread - fits into threaded bores or onto male studs
CK push-in connections (KD3-CK-4, KD3-CK-6) - coupling for CK-normalised mating parts
Push-in sockets KDV-PK-2, -3, -4 - push-in coupling for PK tube connections directly on the line
| Series | Thread / push-in size | Version |
|---|---|---|
| KD1-M3-A | M3 | External thread |
| KD2-M5-A, KD2-M5-I | M5 | External and internal thread |
| KD2-CK-3, KD2-CK-4 | CK3, CK4 | CK push-in connection |
| KD3-1/8-A, KD3-1/8-A-R, KD3-1/8-I | G1/8 | External, internal, check-valve |
| KD3-1/4-A, KD3-1/4-I | G1/4 | External and internal thread |
| KD4-1/4-A, KD4-3/8-A, KD4-1/2-A | G1/4, G3/8, G1/2 | External thread |
| KD4-CK-6, KD4-CK-9, KD4-N-9 | CK6, CK9, N9 | CK and N push-in |
| KDV-PK-2, -PK-3, -PK-4 | PK2, PK3, PK4 | Push-in socket |
Typical applications: Tool changes on handling devices and robots, isolation points for maintenance zones (individual decommissioning without full system depressurisation), rapidly interchangeable test and inspection fixtures, and mobile compressed air consumers with quick-coupling connection to the supply line.




















